Valve construction.



' T. N. SMITH. VALVE CONSTRUCTION.

APPLICATION FlLED MAR.la.191s.

1,255,806. Patented Feb. 5,1918.

2 SHEETS-SHEET l- 'T. N. SMITH.

VALVE CONSTRUCTION.

APPLICATION FILED MAR. 13. 1916.

I Patented Feb. 5, 1918.

2 SHEETS-SHEET 2.

' San Angelo, in the nty of T Y employed.

5?- ST A H Umrnn sra'rns ass s s @EFIGE.

THOMAS NOAH SMITH, O F SAN ANGELQ TEXAS.

VALVE CONSTRUCTION.

I I NiAJM, M acitizen of the United State 0 H S, resid a fat reen and State of Texas, have mm x mm structions, of which the following is a specification.

This invention relates to internal com-' bustion engines, and its primary object is to provide a simple/construction in which rel atively large inlet and exhaust valves may be In engines of this character, and especially those high speed engines usually employed for driving motor vehicles, it is of the utmost importance that the valves have ample .capacity, so as not to obstruct the flow of gases. It is also desirable that the valves be removable inwardly, and thus 'avoid the ne- "cessity for complicated valvecages or boxes set'into the outer wall of the cylinder head,

as has heretofore been proposed. My improved construction also permits a free, direct, and unobstructed passage from the valves through the intake and exhaust pipes.

In order that the invention may be readily understood, reference is had to the accompanying drawings, forming part of this specification, and in which:

Figure 1 is a longitudinal section through the upper part of the cylinder and the cylinder head, showing my improved valves in position therein;

Fig. 2 is an inverted plan view of the cylinder head, showing the valves; and,

F i 3 is a view similar to Fig. 1, showing t e method of removing and assembling the valveparts.

Referring to-the drawings in detail, 1 designates the usual cylinder and 2 the cylinder head. These may be united in any suitable way, the joint being preferably sealed by The stems 1'1 and 12 extend snugly specification of Letters 1 atcnt.

Application filed March is,

- these Patented Feb.,5, 1918.

1916. Serial No. eases.

11 'des 13 and 14, respect vely, id e s being screw threaded at 10 and 16 an being set into similarly screw threaded openings in the walls 4 and 5 otthe cylinder head, one of such openings being clearly shown at 16 in Fig. 3. It will be noted than lie-me guiAQg and l are relatively ion and extend to a considerable di tan on oth sides of the walls 4 and 5, so as'to accurately hold the valves in position and insure their proper axial movement.

Helical springs 17 and 18 surround the valve stems l1 and 12, respectively, said springs bearing at one'end against the respective guides 13 and 14, and at the other end against collars 19 and 20, which are sccured to the valve stems as by means of keys 21 and 22. The valves may be actuated by any suitable mechanism, the usual tappet being indicated at 23.

It will be noted that the combined diameter of the -valves 9 and 10 is considerably greater than the inside diameter of the cylinder head or bore. This large size of the valves is made pomible by forming pockets 24 and inthe side walls of the cylinder head inside of the valves, such pockets extending laterally beyond the outline of the cylinder bore, as clearly shown in Fig. 2. The outward movement of the-valves 9 and 10 is limited by theseats 26 and 27 (see Fig. 3), against which they close, while their inward movement is limited by the shoulders 25'", formed at the inner edge of the pockets. Thus,'it will be seen that the valves are normally confined within'the pockets 24 and 25 which partially surround them'. It will. be further noted that the cylinder head can be removed entirely without in any way disturbing the mounting of these valves. If, a during the operation of the engine, the valve stems should break, the valves will-lodge upon the shoulders, such as 25", and thus be prevented from falling down into the bore of the cylinder.

Fig. 3 shows the method by which. the valves are assembled in the cylinder head. The springs and guide tubes are removed, and the stem, such as 12, is inserted from the inside up through the screw threaded opening 16. This openin is of such size as to permit'considerable p ay of the valve stem, so that it is possible to bring the valve 10 up into position against the seat 27 without di'fliculty. The guide 1% is then slipped over the upper end of the stem 12. and screwed BEE-Tal A f/hi LF-xijLE CC)?" into posit on lll the opening it", ill the same the cylinder, a shoulder between the valve manner as illustrated by the guide 13 in Fig. and cylinder bore ll ti a t x I 5 'lhe 5131 mg can then be placed in posito limit the inward ov t. f id valve tlon over the guide and the collar and key said cylinder head having an opening:

assembled so that the-tension of the spring maintains the valve closed.

When it is desired to remove the valves, the reverse proceeding is, of course, followed. The sprin having been taken off, the guide tube 1s t}en unscrewed and Withdrawn. This permits the valve to be w g laterally, as indicated in dotted lines in Fig. 1, so as to clear the shoulder nd it may then be removed. \Vhat has been said in regard to the valve 10 applies equally, of course, to the valve 9.

By virtue of the improved construction bov described, it is possible to employ Valves of any size necessary to operate efiii tly at high speed, and it will be noted that there are clear open passages connecting the valves With the intake and exhaust pipes, respectively, such passages being obstructed onlyby the relatively small valve stems.

What I claim is:

1. The combination with an engine cylinder having ahead, of a valve and valve stem mounted in the head and movable axially of 1s removed, the valve stem may smaller than the valve, and a relativelv long removable guide for the valve stem secured in sa d opening and having a relatively short bearing therein, whereby, when said guide no cause the er rag e0 will? tit??? 9. 1 he combination with an engine cylingwlnwing a removable head, of a valve and i stem mounted in the head and mov- A 11, 01' the cylinder, a shoulder care-I 'Zsaid head normally acting as a stop 4) to 111a,, the inward movement of said valve, said cylinder head having -an opening smaller than the valve, and a removable guide for the valve stem secured in said opening, whereby, when said guide is removed, the valve stem may be swung laterally, shoulder.

In testimony whereof I have afiixed my signature.

'N( )AH SMITH.

so as to cause the valve to clear said A 

